A review on biogas upgrading in anaerobic digestion systems treating organic solids and wastewaters via biogas recirculation
Journal
Bioresource Technology
Journal Volume
344
Date Issued
2022
Author(s)
Abstract
Biogas upgrading is an essential process for efficient and safe utilization of biogas produced from anaerobic digestion (AD), a cost-effective and environmentally friendly technology for bioenergy recovery from organic wastes. Biogas recirculation in AD reactors has been recently reported as a cost-effective and promising method to enhance methane content in biogas. This review aimed to summarize the state-of-the-art of biogas recirculation-based AD systems to better understand the possible mechanisms and main factors relating to in-situ biogas upgrading. It shows that biogas recirculation in the AD reactor can not only enhance methane content via both physicochemical and biological effects, but also help establish a robust AD system with high buffering capacity for highly efficient treatment of various organic wastes. More research works are demanding for a better understanding of the mechanisms and the optimization of the whole AD system, targeting its further development for high-calorie bioenergy production. ? 2021 Elsevier Ltd
Subjects
Biogas recirculation
High buffering capacity
In-situ biogas upgrading
Methane enhancement
Microbial activity
Biogas
Cost effectiveness
Methane
Wastes
Wastewater treatment
Biogas upgrading
Buffering capacities
Cost effective
Methane content
Microbial activities
Organic wastes
Anaerobic digestion
biofuel
methane
anaerobic growth
bioreactor
wastewater
Anaerobiosis
Biofuels
Bioreactors
Waste Water
SDGs
Type
review